Pen box



FIG. 1 is a top plan view of a pen box showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof, the rear view being the same;

FIG. 4 is a left side view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a right front perspective view thereof.

The rear view of a pen box is the same as the front view thereof. 

The ornamental design for a pen box, as shown and described. 